The K&K Volume Control is a non-destructive, plug-and-play addition to any single-source passive internal transducer system. You can order it as an integrated element with any single-source passive pickup, or as an Add-On for an existing pickup. Simply unscrew the existing endpin jack, remove it from the endpin hole, and plug it into the 1/4" plug of the Volume Control Add-On. The 1/4" plug has a self-adhesive fastener, which can be secured inside the guitar. The lightweight thumbwheel control mounts with a peel-and-stick installation to the inner edge of the soundshole. Mount the new endpin jack into the endpin hole, and you're done! This passive volume control works without a battery. It does not boost the volume, but it allows you to turn the pickup signal down.